May 3, 2011 - 12:52 PM
Your itinerary is fine and allows you to see some major parts of Switzerland. Any change I could suggest is from my personal point of view. Your preferences may be different. That being said, this is what comes to my mind:
Day 3: I would not spend a whole day in town, but rather do some hiking, a boat trip or visit another viewing point. Our website is full of suggestions. Or is this also a traveling day from Geneva to Interlaken? In that case I can only recommend to travel via Zweisimmen (the Golden Pass route).
Day 5: Bern is worth a visit if you like historical towns, museums, shopping, etc.
Day 6: Be sure to travel via the "old" route (via Kandersteg and Goppenstein) rather than the new tunnel. It takes longer but there's more to see.
Day 10/11: I would spend only one day in the city and rather fit a bit more of Alpine scenery into my itinerary, such as the Bernina Express or a hike somewhere.
Day 12: Since you'll be leaving early, you may want to look into an hotel close to the airport
I guess you mean Jungfraujoch by the way?